Good pickup
I'm a mechanical person who has built and repaired a lot of things.
Like all mechanical people when you ask me a mechanical question about something that I know I can almost always give you a mechanical answer off the top of my head
Trump can't do that
Concrete is an extremely water intensive product
Trump doesn't honestly know where he's going to get the water for his water intensive Wall
That is a shocking admission for a guy who claims to be the greatest NYC builder since Robert Moses
And Moses was the greatest builder that ever lived.
My best guess is that Trump is a nobody who is taking credit for the work of many other people

Trump is the least popular president in modern history, according to FiveThirtyEight. "Trump’s early-term unpopularity is unusual. In the decades since World War II, the average first-term president before Trump had an approval rating of 62 percent on his 175th day in office," the site wrote in July, when Trump's approval rating was 39 percent.